#13 implemented
#19 and #14 implemented
#12 implemented
#20 implemented
Error related to #20 fixed
#15 implemented
New setup commit
insertExpenditure implemented
listCritProducts, insertExpenditure and  etc.
Changed the locations of servlet&class funcs
Sales servlet activated and javascript rewritten
Sale product moved to sales
#17 implemented
#21 implemented
#22 fixed
#23 fixed
Merge commit